SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26
System description
Page 19 of 217
Function
Pin Name
Module
Pin No
I/O
Description
Remarks
Auxiliary
UART
RXD_AUX
SARA-G3
28
O
Auxiliary UART
data output
1.8 V output, Circuit 104 (RXD) in ITU-T V.24,
for FW upgrade via EasyFlash tool, AT command
mode
15
, GNSS tunneling
Access by external test-point is recommended.
See section 1.9.2 for functional description.
See section 2.6.2 for external circuit design-in.
TXD_AUX
SARA-G3
29
I
Auxiliary UART
data input
1.8 V input, Circuit 103 (TXD) in ITU-T V.24,
for FW upgrade via EasyFlash tool, AT command
mode
Internal active pull-up to
V_INT
.
Access by external test-point is recommended.
See section 1.9.2 for functional description.
See section 2.6.2 for external circuit design-in.
SCL
SARA-U2
27
O
Auxiliary UART
data output
Not supported by “00” and “x3” product versions.
1.8 V output, Circuit 104 (RXD) in ITU-T V.24,
for AT command mode and diagnostics.
By default configured as I
2
C bus clock line.
Access by external test-point is recommended.
See section 1.9.2 for functional description.
See section 2.6.2 for external circuit design-in.
SDA
SARA-U2
26
I
Auxiliary UART
data input
Not supported by “00” and “x3” product versions.
1.8 V input, Circuit 103 (TXD) in ITU-T V.24,
for AT command mode and diagnostics.
Internal active pull-up to
V_INT
.
By default configured as I
2
C bus data line.
Access by external test-point is recommended.
See section 1.9.2 for functional description.
See section 2.6.2 for external circuit design-in.
USB
VUSB_DET
SARA-U2
17
I
USB detect input
High-Speed USB 2.0 interface input for VBUS (5 V typ)
USB supply sense. USB available for AT, data, GNSS
tunneling, SAP, Ethernet-over-USB
16
, FOAT, FW
upgrade via EasyFlash tool, and diagnostics.
Access by external test-point is recommended.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.
USB_D-
SARA-U2
28
I/O
USB Data Line D-
High-Speed USB 2.0 interface data line for AT, data,
GNSS tunneling, SAP, Ethernet-over-USB
, FOAT, FW
upgrade via EasyFlash tool, and diagnostics.
90
nominal differential impedance.
Pull-up, pull-down and series resistors as required by
[14] are part of the USB pin
driver and need not be provided externally.
Access by external test-point is recommended.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.
USB_D+
SARA-U2
29
I/O
USB Data Line D+
High-Speed USB 2.0 interface data line for AT, data,
GNSS tunneling, SAP, Ethernet-over-USB
, FOAT, FW
upgrade via EasyFlash tool, and diagnostics.
90
nominal differential impedance.
Pull-up, pull-down and series resistors as required by
[14] are part of the USB pin
driver and need not be provided externally.
Access by external test-point is recommended.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.
15
Supported by product versions “02” onwards
16
Supported by product versions “x3” onwards
